layer = 30mph speed limit = 30mph
## # A tibble: 1 x 6
## s13 s14 s15 s16 s18 s19
## <int> <int> <int> <int> <int> <int>
## 1 154 313 307 87 175 61
layer = existing 20mph speed limit = 30mph
## # A tibble: 1 x 6
## s13 s14 s15 s16 s18 s19
## <int> <int> <int> <int> <int> <int>
## 1 50 153 100 56 25 11
layer = 30mph speed limit = 20mph
## # A tibble: 1 x 6
## s13 s14 s15 s16 s18 s19
## <int> <int> <int> <int> <int> <int>
## 1 17 23 17 15 40 14
layer = local 20mph Speed limit = 20